Magnetic system

Claim 2

A magnetic system comprising, an annular, axially magnetized, permanent main magnet having first and second ends; a first plate of soft ferromagnetic material having an inner side disposed adjacent one end of the main magnet and an outer exposed side and edges, and a second similar plate disposed adjacent the opposite end of the permanent magnet; a soft ferromagnetic core extending from the first plate through the bore of the main magnet toward the second plate with an airgap established between the core and the second plate; first auxiliary permanent magnet means disposed adjacent at least one of said two plates and this auxiliary magnet generally surrounding and in intimate contact with and covering only said exposed side and edges of the first plate and disposed in at least a portion of the usual path of external stray magnetic flux, the direction of magnetization of the auxiliary magnet being generally opposite the direction of magnetization of said stray flux of the main magnet where the auxiliary magnet contacts said plate; a second auxiliary, permanent magnet generally similar to the first and disposed similarly adjacent the second plate.

Claim 3

A magnetic system comprising, an annular, axially magnetized, permanent main magnet formed as a circular cylinder having first and second ends; a first plate formed as a solid disc of soft ferromagnetic material having an inner side disposed adjacent the first end of the main magnet and an outer exposed side and edges, and a second plate formed as a ring with an aperture defining an inner edge, disposed adjacent the second end of the permanent magnet; a soft ferromagnetic core extending from the first plate through the bore of the main magnet toward the second plate with an airgap established between the core and said inner edge of the second plate; first auxiliary permanent magnet means formed as a cylinder with a central aperture disposed adjacent said first plate and this auxiliary magnet generally surrounding and in intimate contact with only the peripheral portions of sAid exposed side and edges of the first plate, and terminating at the junction of the first end of said main magnet and the first plate, and disposed in at least a portion of the usual path of external stray magnetic flux, the direction of magnetization of the auxiliary magnet being generally opposite the direction of magnetization of said stray flux of the main magnet where the auxiliary magnet contacts said plate.

Claim 4

A magnetic system comprising, an annular, axially magnetized, permanent main magnet formed as a circular cylinder having first and second ends; a first plate formed as a solid disc of soft ferromagnetic material having an inner side disposed adjacent the first end of the main magnet and an outer exposed side and edges, and a second plate formed as a ring with an aperture defining an inner edge, disposed adjacent the second end of the permanent magnet; a soft ferromagnetic core extending from the first plate through the bore of the main magnet toward the second plate with an airgap established between the core and said inner edge of the second plate; first auxiliary permanent magnet means formed as a cylinder with a central aperture disposed adjacent said first plate and this auxiliary magnet generally surrounding and in intimate contact with only the peripheral portions of sAid exposed side and edges of the first plate, and terminating at the junction of the first end of said main magnet and the first plate, and disposed in at least a portion of the usual path of external stray magnetic flux, the direction of magnetization of the auxiliary magnet being generally opposite the direction of magnetization of said stray flux of the main magnet where the auxiliary magnet contacts said plate.

Claim 5

A magnetic system comprising, an annular, axially magnetized, permanent main magnet having first and second ends; a first plate of soft ferromagnetic material having an inner side disposed adjacent one end of the main magnet and an outer exposed side and edges, and a second similar plate disposed adjacent the opposite end of the permanent magnet, one of said plates being generally conical in cross section; a soft ferromagnetic core extending from the first plate through the bore of the main magnet toward the second plate with an airgap established between the core and the second plate; first elastic auxiliary permanent magnet means disposed adjacent the conical plate and conforming to the shape thereof, and generally surrounding and in intimate contact with only said exposed side and edges of the plate, and terminating at the junction of said first end of the main magnet and said first plate, and disposed in at least a portion of the usual path of external stray magnetic flux, the direction of magnetization of the auxiliary magnet being generally opposite the direction of magnetization of said stray flux of the main magnet where the auxiliary magnet contacts said plate.

Claim 6

A magnetic system comprising, an annular, axially magnetized, permanent main magnet having first and second ends; a first plate of soft ferromagnetic material having an inner side disposed adjacent one end of the main magnet and an outer exposed side and edges, and a second similar plate disposed adjacent the opposite end of the permanent magnet, one of said plates being generally conical in cross section; a soft ferromagnetic core extending from the first plate through the bore of the main magnet toward the second plate with an airgap established between the core and the second plate; first elastic auxiliary permanent magnet means disposed adjacent the conical plate and conforming to the shape thereof, and generally surrounding and in intimate contact with only said exposed side and edges of the plate, and terminating at the junction of said first end of the main magnet and said first plate, and disposed in at least a portion of the usual path of external stray magnetic flux, the direction of magnetization of the auxiliary magnet being generally opposite the direction of magnetization of said stray flux of the main magnet where the auxiliary magnet contacts said plate.

Claim 7

A magnetic system comprising an annular, axially magnetized, permanent main magnet engaging on either side a soft iron plate, at the center of the main magnet a soft iron core is arranged so as to be surrounded by the main magnet and one plate, the other plate forming together with the core the useful airgap, while at least one of the plates is provided with an auxiliary magnet formed as an axially magnetized cylinder with a radially magnetized disc closing one end, and thus magnetized substantially in the opposite direction as the adjacent main magnet, characterized in that the auxiliary magnet substantially completely covers one of said plates and generally surrounds the same, said auxiliary magnet being in intimate contact with an exposed side of said plate and having a flange portion in intimate contact with edges of said plate and terminating at the junction of said plate and main magnet, the direction of magnetization of the auxiliary magnet matching the shape of the plate and being at right angles to the surface thereof.

Claim 8

A magnetic system comprising an annular, axially magnetized, permanent main magnet engaging on either side a soft iron plate, at the center of the main magnet a soft iron core is arranged so as to be surrounded by the main magnet and one plate, the other plate forming together with the core the useful airgap, while at least one of the plates is provided with an auxiliary magnet formed as an axially magnetized cylinder with a radially magnetized disc closing one end, and thus magnetized substantially in the opposite direction as the adjacent main magnet, characterized in that the auxiliary magnet substantially completely covers one of said plates and generally surrounds the same, said auxiliary magnet being in intimate contact with an exposed side of said plate and having a flange portion in intimate contact with edges of said plate and terminating at the junction of said plate and main magnet, the direction of magnetization of the auxiliary magnet matching the shape of the plate and being at right angles to the surface thereof.

Claim 9

A magnetic system according to claim 3 wherein the auxiliary magnet comprises an elastic synthetic resin including therein a permanent magnetic power and corresponds in shape to the adjacent plate.